base: Discardable memory types.

webkit/child/webkitplatformsupport_child_impl.cc

Index: webkit/child/webkitplatformsupport_child_impl.cc
diff --git a/webkit/child/webkitplatformsupport_child_impl.cc b/webkit/child/webkitplatformsupport_child_impl.cc
index 3bb2b1954cb9d14d475b57ceec74e4e1dd31244b..8dec58df4ed60d13477f0e7fe50f5f4c7e9ccbc7 100644
--- a/webkit/child/webkitplatformsupport_child_impl.cc
+++ b/webkit/child/webkitplatformsupport_child_impl.cc
@@ -93,7 +93,8 @@ void WebKitPlatformSupportChildImpl::didStopWorkerRunLoop(
 
 blink::WebDiscardableMemory*
 WebKitPlatformSupportChildImpl::allocateAndLockDiscardableMemory(size_t bytes) {
-  if (!base::DiscardableMemory::SupportedNatively())
+  base::DiscardableMemoryType type = base::DiscardableMemory::GetType();

[Philippe, 2013/12/18 09:07:47]

Just realized that there was this SupportedNatively() check here :) Does this
mean that emulated DM isn't used (yet)?

[reveman, 2013/12/18 19:44:25]

Existing code in blink that uses discardable memory doesn't get to use emulated
yet. Skia and the new image decode cache that is implemented in skia gets to use
it though.

The plan is to enable this later once we've transitioned to using the new image
cache everywhere.

+  if (type == base::DISCARDABLE_MEMORY_TYPE_EMULATED)
     return NULL;
   return WebDiscardableMemoryImpl::CreateLockedMemory(bytes).release();
 }